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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6bd392e3645222a01533197ffc8d10a19001bdf2143c4a36f4b9243882203c' 
  AND token = 'q3EqmPVMvNbUEGT+M5N6P4/D0bLMFHHpl693DncYXYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}